When cats first enter a strange environment, there are strangers around, and there are loud noises, these conditions will cause cats to have a stress response. They will show unease and fear, and will crawl into dark corners for a short period of time. If the cat does not eat, drink or defecate, it may cause vomiting and diarrhea. In this case, the owner should comfort the cat more to increase the cat's sense of security.